Hi,
We would require to do some test with reCaptcha beginning of next week.
At this moment, we would be able to give you more information about it.
We do not implement this integration so it is quite difficult to provide some support on it because it is not our component.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.